Most Star Trek tried to be meaningful on one level or another, but “The Immunity Syndrome” is basically an episode at face value. It’s The Enterprise vs. a big space amoeba with nothing underneath.
That’s not to say it isn’t enjoyable. Even for a shallow story, it’s high concept and the characters and the various conflicts they find themselves in elevate an already good episode.
There’s very little under the surface, but then again whoever said that EVERYTHING has to have a deeper meaning.
Interesting Fact: This episode makes one of the earliest references to black holes, a term that was coined by theoretical physicist John Wheeler, being first used in his public lecture Our Universe: the Known and Unknown on 29 December 1967.
“(Humans) find it easier to understand the death of one than the death of a million. You speak about the objective hardness of the Vulcan heart. Yet how little room there seems to be in yours.”